[ibis-macro] A technical question on UI
- From: "Muranyi, Arpad" <Arpad_Muranyi@xxxxxxxxxx>
- To: IBIS-ATM <ibis-macro@xxxxxxxxxxxxx>
- Date: Wed, 18 Apr 2012 22:09:04 +0000
Hello everyone,
An interesting question was raised in the Editorial Committee meeting
this morning, and I got the AR to write an email on this reflector
to solicit for some comments and feedback.
The question is revolving around parameters which are expressed in
terms of UI (unit interval). A statement was made in the Editorial
Committee meeting this morning, that if a parameter is a
Reserved_Parameter, the tool will know what to do with it because
all Reserved_Parameters are completely described in the specification.
However, if the parameter is a Model_Specific parameter, the EDA
tool will have to convert the value from UI to time and pass the
time value to the AMI executable model.
For example, if the bit time is 400e-12 (ps) and the UI value is
0.5 for a certain parameter, the EDA tool would have to pass
200e-12 to the DLL, and not 0.5.
(Please correct me if this summary is not accurate).
This surprised me, because I don't recall anything in the IBIS-AMI
specification that states that the EDA tool has to convert parameters
expressed in UI to time and pass the time value to the DLL. If I
were writing the simulation software, I would just pass 0.5 to the DLL.
Does anyone have any comments on how this is supposed to be handled
by the EDA tool?
Once we have consensus on that question, the next question will be
whether we can correct/clarify this as part of the Editorial
Committee, or whether a BIRD is necessary to address this question.
Thanks in advance for the comments,
Arpad
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